Origins of reiki, (Shinto)
DEMON'S SOULS (PS3)
Mushi-Shi (anime) box-set trailer

Read,
Occult Japan : Shinto, Shamanism, Or The Way Of The Gods
by Percival Lowell

Shinto is not the same as it once was.
It used to prominently focus on possession, spirit placation and communion.

Korea is a place you should look to if you want to study the historicity of where ideas in reiki come from.

What you experienced,
within cultural context of Korea (similar enough to Shinto in many ways)



Two very good books on the subject in english are Korean Shamanism -Muism by Dr. Kim Tae-kon & Chang Soo-kyung, and Kut : Happiness Through Reciprocity by Hyun-key Kim Hogarth

Korean Shamanism segment (youtube)

1hr 30min worth of orating on the subject by your's truly..